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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2395b82ae3e2358b2a9e406f47f56b9c0fc0f919127233537cb4492345e511e4' 
  AND token = 'E+AmeImF5oa2vl5x/2Vug1pR/erLw1Xc2Wut6ucWjJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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