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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6af8d8fa02fac43bb7babbbe3d0a7b98b76a4234fccf41eaf8ed30752f449c' 
  AND token = 'gy/akO5uqu5aj/y5U49ASvGMZpwiWodBGcHWSq4xG9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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