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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c14f5d9b1f379ce58698903826d5b16af3f73758d58ed5b3ef5c8ceacf9b61' 
  AND token = 'gBs4uqzQxmryqiX9aiVsKX1gGR7I9UaaedogVnJnIic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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