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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd83098314493d2eb8a23f2a79a74d61354ed6946e5123f4eac2f269368e4f33' 
  AND token = 'opIxvrzOQBXyO6SY14mWpc/4nUB/e5JRdFnuICpT2po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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