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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54127359d4286457264889ee3115419619e3d189c26ea6f1a095aa440dc81c30' 
  AND token = 'OxcQzZVMHl+I6qNcy+7hvCAffmZuEypX7lhy4sESfOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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