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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c2203a234b8d89a82c113abd6f34762a9f61a5f2c613723db931710f52ded7' 
  AND token = 'ELu1flK296h9VJJ3ihrHz4LC6o1gmnD2agwIozggRjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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