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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df97d469cc74983b33286541d7e9faf5857be4b52b230eae6421fee94114f683' 
  AND token = '1HwzvB3/LG9t8e2C8RMfYW1HWHrUorW1Df/50WAvFGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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