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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3927cbc41c4e36651f56a72afcabced1c6f12fa289901910eb74927daba4edc8' 
  AND token = 'uhp74rBdNL7NjVirTcNh2Lz9xHk/MVMefZEfYm/IkMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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