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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ca58d6c397074539d8235b5f4234d7a85869c2193c8926f1d91bc2216b2354' 
  AND token = 'lboj4xP2zpcJcYsqNsf//eJm4mQ1fbZlNUMu4zOjyaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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