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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c527fafba95da236e28e6c9a585aee47d4650101bf1f1ede0f1eb4688549b1fb' 
  AND token = 'rVur1IKRvy3ridfGr9kNPtn1xr7lli+5U0V0y2bhd2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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