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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24e4f1b927f18ef2f0f0d467761eec16ce9129cac2589e63f470b1b6faa0368' 
  AND token = 'UjZFhr6KJW+Sqmbz0+pHY7IQJu6b+TcQrgNZ8PPR1mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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