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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9f1b5944fe900a68ade79ac3512c68b5a64882e4201b6a4a9c2a79b2891f52' 
  AND token = 'gHF6EaSNq7PcYxChV/cJvGFNsxkz7S2PbyBdZNmkiuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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