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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b65d11a229628a1f4391abf737ece5ab98381604fa865d54100b00f6ddff96' 
  AND token = 'PtE8MnZSyy2JcwJWEtOQBOqUZxnFazy9qwD6NMY91JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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