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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2236ce0abe70c61aa687cb26006d47d9d4ee5c5ce79b28a1c42812b3668756bb' 
  AND token = '2ypaiOJwFsCy3StPGy4ThEQ2I3yAjwd2QjYbRh2wXxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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