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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8018b26955b016513dcbce779e2e79fedf1e2ac9bd954991a83ee3fceb67b838' 
  AND token = '6Ikrnp4Np597ZqpSdvynEreHmzG99/SN6JWz0FQzLw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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