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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156604f43dd1fe4d08251388775cbb9cd59d82193621c2c7a3e3ccb26dd5cb47' 
  AND token = 'RjgsmER5S2sunCLLki/9r35l6mZ2TLr7R+0JXM0papw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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