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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e982821a679fbfc67d3a56155a8e26ed75040cbd8148def2896d205fad0ccdf' 
  AND token = 'KAYtfbbHVxoU9vbaE0YRZwDn5GR54+ujCkOSuBQIhkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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