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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1011a67ed5f2502c336ba415f11aa8cf8dc679a9a10fb76fd18b258e7cc9d8bf' 
  AND token = 'alPe8ud2u5KVx8gPEiLc2HgBgXrhV54K9kI9wIh6JEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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