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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd021515727abdd549a455ff3f5e953cc3906ddef546e5c481c6b4b75c81251ed' 
  AND token = 'bepVf4EoI3ov33ZQ8LYNMMBEJH7g/J8TVoPQYKVMD4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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