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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2d7e668700f86f8f8dc785068f7f9fb7c96dfb96af17832e153d8507c5f64d' 
  AND token = 'bDegs8Lt3IKBNYF9jvxD0DtuAS226vesV6dqX9emxHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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