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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1666ae935b57d4b89735cde2f2b3197aae0399900efc6e625ba7c6903b49a0ff' 
  AND token = 'XrvFqSCwo31Lq6Y2OAjqnKyaUIWYngcb/9cAcKz3IYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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