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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '576c27b27a1e00d173c929e9dbe5cbe0047a91bf20fc571188647948f16c2266' 
  AND token = 'J6JrHjc/K4FPP6QxnextgP5/tvw9TcjogO18o6moUw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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