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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01983e140c0e7214986d5b6935c127de0a934c1398d8d6b1c40d2a7711e865f7' 
  AND token = 'zE6DgDqksvmcS605CEoY1VloDMNHh6tS+4DpitvLRa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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