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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9f5b1d76924fcbfaa3fb35bf3c264cefb70397ebd6a289c6fcb46d7f0ef7c1' 
  AND token = '+jedZvc1aHrnWPgwOScfUE7oIP4zZVAOM66ww9E3jIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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