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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2186d995c7a92b5158f18271d419d76d77e4ec689e7ad9cee0252fda418c469a' 
  AND token = 'kQB5PHkgHMxsyb2Wp4KFcOdzzQR5xFr/+kD0vOcApnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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