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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2639b81425367314e086625e4ee5f497f34187e9feef44cb2d6223e51e6956c5' 
  AND token = 'QwIsoUvBgJzHLo5JQ2eCcPyC5tSGsZ/5Bx4SaIBBU7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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