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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1778f41bb9bd929053fc4b8c083cb9a5b3275dcb940d1eab745c87a558cb03a9' 
  AND token = 'BsKrqfMln5KLVSvm/po2ps0wCb661wh2oO1WVKnaJ+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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