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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa4a55393b8f887dd822d666dafa3a824cd975cce674cdc6eabbf5291a1ac08' 
  AND token = '8aBh5/WB96yQ7WHnpda0+Tc4f+/wjvn+q8qck32EbDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}