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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ce3bc63f08bf4ce21419c4d6d5b491bc96b63a250de085d9cf9c9301b26863' 
  AND token = 'gtfez+XiHIlK3zQv10yeIiOhmGrpuMKqCOeMaunxBEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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