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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74818ed0103e6d2dd05118876478cb61a7479529f3d7bb9378cfde012b140fc' 
  AND token = 'Ev4576IVXlJVOIuAckQMtOcF2HWACy/hT+bNUau2lsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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