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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dee4522af2379e90382d59d20da6b8e55cdc0be5459a5a86be5f5ee9536892a' 
  AND token = 'sgIiTnuaHyDEpjHIVEwdUDqT9z67VZd3CYFveMqQAoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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