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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1e321c5377fe5fe351dae160c51b7b2bfbe66ac870f47e2b739020496cd69d' 
  AND token = 'KIZKlVGEd1a6cM5fvc4xtt8OmYhdjhHEP4uiANZ9LOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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