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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60f929544e5186463b4ffd46dafd957b01a45b4eb7b6213c3210d4bdc512601' 
  AND token = '4e+IPHhlaIpN+mygnmCiTea8Xu8BW3Cn67c9DJP22Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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