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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed703a02644c019453d42390c495b13f56d9d70e59d2b4a5f1ee278a7e74f28b' 
  AND token = 'SkL743H9JXv4vITrywzYAdH9gVQtcHBFuz6POnN3XZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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