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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2387df6bbcb916fd7855b8d400e9e4ef4f622e45816e6b6f8a4f1ccd19a58d2a' 
  AND token = 'od2nyH8mP3uZN80jdLB4CMtTEQWk545cRBk+2DTdk9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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