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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a68932cc3ed21f3af3cc7e0fe3b58ab5e1154a6e063ae272d0c9f4a988b5253' 
  AND token = 'h7+fYJ7AJArApBWH4rsrNEQpc8K4AizdZUNMiUZaTj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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