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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1eac66dd2743ca2dc8e8fffc4d3e5384de322d33fe0c2f12e5313365f9bb8a1' 
  AND token = 'au9yBmkp2eH60cV3n1qSFLidbrUsYBzK0j+aASWdVtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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