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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd211dee4020870aaa2f2f45e06033775b3dd70f1510a44e1eda5286f4abb1a40' 
  AND token = 'FF0Y0rvtgyfkWurPca0tJDN6pItmXMPDLGloabYFC7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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