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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c1fed59886bfadb75bea1c25afde9d529977fb664852baad43f610d0c59b40' 
  AND token = 'c338gPymya+84ES+MG9YYqVol1MeyMVg+M6QYxjP1nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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