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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6607e955d0da8a5ef05b25327ce843ca1b893101091efa8e29328c71c9d536e5' 
  AND token = 'arSTT7Cna/uZqyPD2NmGwh39DXzVI6xaUSrM+8W1gO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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