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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e5415809206e6214f22fc0a441bfad3b4bf1b6e9188e78a113baa452ca4cc1' 
  AND token = 'ZuPE/G10WcuRiPHGm8AP8LZ+FYaYyhK8p9vHtYYr3Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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