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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad030c294058ce1be20227392614ca0654a96a5f9a83a14b17c34c4e7078cb07' 
  AND token = 'Gv5kumy1gUteX6kEowf8VyVje7bHFogb5yxtJTdR15w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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