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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4abcbae50ff41f93702483a687dbde440ee7b784bf05a0854d10d08062fdebc' 
  AND token = '9u7wtkCFj3snTPh9uI+75Ujs315TvB3lmLDN2y5Ltl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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