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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5e1226c61a6c2d168b05be6c0cffdca3dee767122d6c87fdbc71ca1abf9a6b' 
  AND token = 'nOYWShdTWxuDWvZ4oY9hBNO/xz0jKuMEuc700a+i2KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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