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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6356cad8cc301388879de89c31f0dc9fc8dd419f0ca7f06afc07b48fe5c3c1aa' 
  AND token = 'ErBEpnqgmNFYU6SFkOHl+pFKiIG8WMxQTdnkEjx6PaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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