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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688b9144f2e5248ee6eec48245e1ca8a28c0f32c6bc289a7777ac4d79ca37c27' 
  AND token = 'uX88aNvTW5JP2OXVdTh0/Xb8nusWJBetkQ3tpR36pUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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