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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9981c41cafb1e38b7ebc86e5d981e8026372be33f897b1d5a2db0921cd089f2' 
  AND token = '99zNzGgjxIS5qG66K4HaWXRIw8nxH4/2LDgpGg5zGLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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