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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfca2dbdf396586e0f7095240c46f63d0642502eb836828ecc176b1d71a2563' 
  AND token = 'F9L+podD4hMB8BXHNRQZ3UyICiylVXpdydQWk+dp1VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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