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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d6545fed2961b36e89868742088402121e740b4ad424702e029e5bdafea439' 
  AND token = 'qKqU2LlS07PVYwtHC2wyeot1Oi97JF8RsPU8Fsff2B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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