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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5c4ccd710af14e76869634f3f3271b9beaaa67135783a47df4255115f35b97' 
  AND token = 'dsTDE5Q2HS4Gs0gYenV4cMpU+tOGpN/cOrbuXHuDBQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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