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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaacbffdea3baf0f1f8046dc210e2955b27ae3266ba6f459523c6f03653d68ba' 
  AND token = '10K74RFVRXtiP1oeVVBI2JceQBRY/wMWSaZjDuOhHpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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