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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88506d1a6b971f9a353bf61be450e6e596c67b435c5cab431a165a8c430ac6ea' 
  AND token = 'mcrlP6/UKRrNKJoaN6uDQi2VpRU21zDs2hmqXyveDb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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