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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e33f0deb654dae0fff15e39a935d459bded4fcf23e88b7b0437da23ef31bcb' 
  AND token = 'iWadrUOMVw0eBua+YKch3r98dg96iwNl9PX0ial4Jmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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