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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a122f4555244258f4ac5efecb55de9debce1d092289cb94f83dea48ef4331d' 
  AND token = '4m7dpWBaGh25O1Z41Kb9ZS/0KfgLRqjIqk7OZ0NT9/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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