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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccff997c0cd203710ea3064428e906daba9bda7153af5aa44a1ed2ede560274' 
  AND token = 'jRsvj8uyWJf8iCywXPZEmq0ppgP/AzHC3yG4MvHFxyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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