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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0d132aa799ab81042f72b369f29169e51ea2c2ab47aac53efc75a9815de755' 
  AND token = 'sEIS7QX0/OKswUkRHQ433467xwDSP1D5Mh9FUs3zjNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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