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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36944cd9fe46b1ab5474425c11b744ac50928a33b65b08556ef01065ac4c47a' 
  AND token = 'Un4cWr91EG5fMIOxXK0cTKVVL4kOsogl5o/J77wO5DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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