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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a76b05b50a8268aa42d8e02988538f057ad82aa98c77e48b88da7e4a15f1b3a' 
  AND token = 'd+g0e1xFzGoTIaZFoFc/hnwc4yJoO/CJBhovPb+AUUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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