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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e4e17c01d9535d700d1749e52570023d05aac87bc11d6d33cc6aee8004564f' 
  AND token = 'q3NGUBLR96e56d0j8moXR5bAbeqNiLRHHLcKVwd5qU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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