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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ec6056f919cd9a2533924e785da807a959e9a0b2f6ac80c57291b279b7cdc2' 
  AND token = 'ph0qrzeyNM4iymGXy7U/cjiHE4A772Q6raZDuApSU/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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