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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55943084a1c23de20b15435b1f9c8e724a087b15af665bd3deb3b86b1cb673d0' 
  AND token = 'EONha4bcXWn2KSrOGh7kL8iVwUruK1GMR5ZBsl0MIEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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