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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc85f1695a268deb884ee460d094405fd6db648dcbb4d189b0dc1471d26523e' 
  AND token = 'm4ZX2VrhMod6YgQ5fwqBaVvwTssH58iqE6fVCPPuK84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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