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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ecc7a507d189c9e64db6af49831b33fa4b90d7cf7b1d7665fb2dce656e17c1' 
  AND token = 'YjU5ztKldXuIpfJ6iDwqelIwLIXpdLuiJsclEFF6l90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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