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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71e22d319ff7540a93691221f3e4c3e4e487439e69b955a9dce10ae6f6afdb3' 
  AND token = 'mZtZ1+ta3MaZn1WS79r3UVwIEM/dDk8GfqQHcd6QRxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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