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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3238ee66f3e1d29c859a0dd9e7d2f1b35f2642249a2f1a098bca28e5db6d312' 
  AND token = '2wKK/7qC178qXGaolZR+QpDo9JwOw1zxc0QUNdowX8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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