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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c0ace48b8dbf6769afd06c6ad744d28d5e209305ef6734fd06484be04946ff' 
  AND token = '8C2QIspvE0+F5UIeRHMe3bMfgH1mdakFWXR4dSdbxyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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