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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ca93a7b7445c1b5be28112da958a2955d4d12563a9820948102739d4b7ba54' 
  AND token = 'lqZh5OuyTK9cXIpy2PdWuzsgtdmlU1lKiaTCMXyRiaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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